算得数,填口诀._刷题宝

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算得数,填口诀.

上一题下一题 0.0难度选择题更新时间:2015-05-23 07:32:06

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看图，写出减法算式．

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先化简，再求值：

\frac{1}{a + 1} - \frac{a + 1}{a^{2} - 2 a + 1} \div \frac{a + 1}{a - 1}

\sqrt{2}

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